I begin to work with Wordpress, I'm developing a theme with many functionnalities into it, and I'm good with that.
My question does not have to do with theme development, but more with general knowledge about Wordpress. I would like to know which files are safe to edit in a standard Wordpress installation : files that will not be overwritten when we perform an update of Wordpress for instance.
I know of
wp-config.php, but are all others at the root safe too ?
I ask this because I want to add filters in my Wordpress website and those filters will be independant of a plugin or a theme. Currently I added them in
wp-settings.php but I found nowhere if this file is safe to edit.